The exact sales figures are: 1,710 i3s sold during September 2015, up from 1,022 i3s sold during September 2014 — altogether, representing a 67% year-on-year increase in sales of the popular electric city car. Year-to-date numbers show a similar trend, with 7,893 i3s sold so far in 2015, and 3,104 i3s sold during the same period of time in 2014. Altogether, this makes for a 154.3% increase in sales of the model.